package com.sky.service.impl;

import com.github.pagehelper.Constant;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 分页查询
     * @param dishPageQueryDTO 查询条件
     * @return 分页结果
     */
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        // 属性拷贝
        BeanUtils.copyProperties(dishDTO,dish);
        // 向菜品表插入1条数据
        dishMapper.insert(dish);
        // 获取insert生成的主键值
        Long dishId = dish.getId();

        // 向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && !flavors.isEmpty()){
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            // 批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断菜品是否关联套餐
        List<Long> setMealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setMealIds!=null && !setMealIds.isEmpty()){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 判断菜品是否起售中
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                // 当前菜品起售中无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 批量删除菜品
        dishMapper.deleteByIds(ids);
        // 删除菜品关联的口味
        List<Long> dishFlavorIds = dishFlavorMapper.getDishFlavorIds(ids);
        if (dishFlavorIds!=null && !dishFlavorIds.isEmpty()){
            dishFlavorMapper.deleteByDishIds(ids);
        }
    }

    /**
     * 根据菜品id查询菜品和口味信息
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据菜品id查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查询口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品和口味信息
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        // 修改菜品信息
        dishMapper.update(dish);
        // 修改口味信息--先删除再插入
        dishFlavorMapper.deleteByDishIds(Collections.singletonList(dishDTO.getId()));
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && !flavors.isEmpty()){
            flavors.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 起售停售菜品
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
